Magnetostrictive electrohydraulic differential amplifier
(57) Abstract:The amplifier is designed for use in electro-hydraulic actuators of different machines. The amplifier consists of a body, spool valve, differential straightforward magnetostrictive actuators, two guide sleeves of a nonmagnetic material, two distributed control windings, two permanent magnets, the two parts of the control unit and leads for connection to the lines of head, discharge, hydraulic. The technical result is an increase in accuracy, performance and reliability. 1 Il. The invention relates to hydraulics and can be used in electro-hydraulic actuators of different machines.Known electro-hydraulic amplifier, which contains the source (unit) control of electrical signals, the spool valve and the Electromechanical transducer, consisting of a package of bimorph piezoelectric elements in the form of a split drives installed on the surface of cylindrical shells with constant and variable throttling elements .Famous electrohydraulic amplifier consisting of hydrocal and movable element of the Electromechanical transducer, the electronic key and the delay unit .The main disadvantage of the known devices [1, 2] is the lack of accuracy and performance, low reliability. Their piezoelectric Electromechanical transducers have leftove kinematic coupling, which reduces the accuracy of positioning of the valve element, which tends to decrease with increasing temperature environment. Pulse mode control moving piezoelectric actuators reduces the performance of these devices. In addition, they have a rather complicated structure, especially the device , and piezoelectric elements are sensitive to shock loads. This reduces their reliability and accuracy.The closest in technical essence to the invention is an electro-hydraulic amplifier, selected as a prototype, which includes a housing, a sleeve of plastic material with a distribution valve, a rod of magnetostrictive material, an electrical winding, the control unit and the transmitter .The known device has poor accuracy and speed of positioning of spool valve, reducing the area of technical p is yet to reduce the impact component of the temperature error and the residual deformation in the process of change of homogeneity of the ferromagnetic environment. Magnetostrictive actuator amplifier operates in the lower part of the magnetization curve with a pronounced nonlinearity of the second order and has a non-linear output characteristic. This reduces the sensitivity of the transducer and leads to nepovtorimosti performance. The hysteresis magnetostrictive actuator does not allow us time to control the reciprocating movement of the spool valve and leads to a temporary delay in each phase of the progressive movement. The result is reduced performance of the amplifier.The technical result of the invention is to improve the accuracy and processing speed.This objective is achieved in that in the magnetostrictive electrohydraulic differential amplifier, comprising a housing, which has a spool dispenser, connected to the line pressure, the drain and the hydraulic motor and one end connected with a straight magnetostrictive actuating element coaxially mounted thereon a distributed control winding, the conclusions of which is connected to the control unit, inputs of the second similar m the second part of the control unit, one end of which is connected to the other side of spool valve, two guide sleeve of non-magnetic material, in which are mounted differential magnetostrictive actuators, two permanent magnet fixed to the first and second control windings, respectively.Structural scheme of the magnetostrictive electrohydraulic differential amplifier shown in the drawing.Magnetostrictive electrohydraulic differential amplifier includes a housing 1, the spool valve 2, the differential magnetostrictive actuators 3, 4, two guide sleeves 5, 6 of non-magnetic material, two distribution control windings 7, 8 with permanent magnets 9, 10, the control unit presents the two parts 11, 12.The amplifier includes a housing 1, in the middle part of which is placed spool dispenser 2 having leads for connection to the lines P, T, A and B pressure discharge and the hydraulic motor, respectively, and differentially spaced rectilinear magnetostrictive actuators 3, 4, mounted in the same guide sleeves 5, 6 of nonmagnetic material is to Bolotnikova distributor 2, other fixed on the end surface of the housing 1 of the amplifier. Coaxially with him the entire length of the set of the same name distributed control windings 7, 8 with permanent magnets 9, 10 connected to the first and second parts 11, 12 of the control unit, respectively.Magnetostrictive electrohydraulic differential amplifier operates as follows.Before you begin amplifier (see the drawing) on the findings of the parts 11, 12 of the control unit are formed of a single-phase current signals of a given amplitude, which are received in the first and second control windings 7, 8 and create in their workspaces longitudinal electromagnetic field. Under their influence (Eph. Joule) is the elongation of the magnetostrictive actuators 3, 4 (a ferromagnetic material with positive magnetostriction+) that does not cause movement of spool valve 2, but creates a mechanical longitudinal tension, which positively affects the formation of the magnetic texture, i.e., improving the efficiency of the control elements 3, 4.After that, the control signal from outputs of the parts 11, 12 of the control unit produces out of phase for a given control algorithm gold is providing. Differential location of magnetostrictive actuators 3, 4 relative to the spool valve 2, the conclusion of their guides in the metal shell 5, 6 enhances accuracy and performance by increasing their rigidity and vsekommentarii components of the temperature error and the error hysteresis. It promotes the growth of beneficial power amplifier. To obtain a linear characteristic of its differential magnetostrictive actuators 3, 4 podmaniczky permanent ring magnets 9, 10, respectively, to set the working point on the linear plot of the functional of the magnetization curve.To suppress the effect of obliteration of the Electromechanical Converter (2-10) can be controlled by signals from the control unit (11, 12), the modulated high frequency.Execution of the amplifier pseudopodial scheme improves its main technical features, cost and weight and dimensions. The latter is directly related to the applied magnetostrictive material for the manufacture of actuators 3, 4. In this regard, it is expedient to apply the composite material on the basis of the coherent field, than that of the ferromagnetic rare-earth group, such as TbFe2( = +2,5103, t =20oC), under the same conditions, but several orders of magnitude below the cost of production.The above allows us to speak about any significant differences between the claimed device and the prototype to achieve a positive result.Sources of information
1. A. S. N 1116229 the USSR, MKI F 15 B 3/00, BI 36-84.2. A. S. N 1078146 the USSR, MKI F 15 3/00, BI 9-84.3. A. S. N 1710864 the USSR, MKI F 15 3/00, BI 5-92, prototype. Magnetostrictive electrohydraulic differential amplifier, comprising a housing, which has a spool dispenser, connected to the line pressure, the drain and the hydraulic motor and one end connected with a straight magnetostrictive actuating element coaxially mounted thereon distribution control winding, the conclusions of which is connected to the control unit, characterized in that it introduced a second similar magnetostrictive element coaxially mounted thereon control winding and connected to the leads of the second part of the control unit, one end of which is connected to the other side spool distribution is klonnie actuators, two permanent magnet fixed to the first and second control windings, respectively.
FIELD: production of hydraulic distributor for electro-hydraulic amplifiers.
SUBSTANCE: the hydraulic distributor is intended for use in electro-hydraulic amplifiers and is supplied with the drive of a sliding valve made in the form of a turning electrical motor, on the shaft of which there is a cantilever eccentric with a ball bearing. On the sliding valve there is a groove for interaction with the bearing and the shaft sealed with a reinforced sealing ring.
EFFECT: the invention ensures increased efficiency of the hydraulic distributor operation.
2 cl, 4 dwg
FIELD: fluid-pressure actuators.
SUBSTANCE: system of hydraulic valves comprises first actuating connection and the second actuating connection which are connected with the hydraulic consumer, system of supplying connections that has the connection with the pressure source and connection with the vessel, first valve system that disconnect the system from the pressure source or controllably connect it with the first actuating connection or the second actuating connection, second system of valves that disconnects the system from the vessel or connects it controllably with the first actuating connection or the second actuating connection, and control unit that controls the first valve system and second valve system. At least one valve system is provided with the pickup of the extent of opening connected with the control unit that controls the valve system depending on the signal from the pickup of the extent of opening and reference signal.
EFFECT: enhanced precision of control.
15 cl, 3 dwg
SUBSTANCE: device comprises sleeve with step outer side and axial passage that receives two cylindrical collars of the step slide valve whose third collar is provided with face stop. The outer side of the smaller diameter of the sleeve is provided with the first and second grooves interconnected through the axial passage. The outer surface of greater diameter of the sleeve has two chamferings whose surfaces are connected with the axial passage through openings. The first collar is arranged near the face of the slide valve opposite to the stop to define a control chamber, is provided with two flat chamferings, and is made for permitting cooperation with the ports of the first groove in the sleeve. The second collar is separated from the third collar by a groove and is made for permitting cooperation with radial openings of the sleeve. The first groove is open from its face, and the ports of the second groove are connected with the space defined in the axial passage between the collars of the slide valve.
EFFECT: enhanced efficiency.
6 cl, 10 dwg
FIELD: engines and pumps.
SUBSTANCE: method and device are intended for control system operated by gaseous working medium. The method consists in the following. With the switched off electromagnetic drive windings, the armature is set at its travel centre, and, during drive operation, electromagnetic forces are induced on the armature each side in turn. Here, air being distributed is forced to blast the electromagnetic drive stator and windings to create equal in size and opposite-sign forces acting on the armature along its travel. The distributor is made up of two concentrically located cylinders jointed by a connector in their central zone. Coils with windings are arranged between cylinders on both sides of the connector with a gap for air to pass through. The smaller diameter cylinder accommodates a cylinder rod making a dual-action armature with blind holes on its every end to accommodate the springs resting against the covers, thus retaining the rods with an equal clearance relative to covers. The cylinders walls have two rows of inclined holes symmetric relative to the connector jointing the cylinders.
EFFECT: lower electric power consumption.
2 cl, 1 dwg
FIELD: engines and pumps.
SUBSTANCE: valve has a body with the feed pressure supply channel, an outlet channel, a controlled pressure outlet channel and an inner boring accommodating a control valve with an inner channel with throttle communicating the inlet channel with the left-hand space formed by the body boring and the left-hand end face of the said control valve and communicating with the outlet channel via the control valve, and a channel communicating the outlet channel with the right-hand space formed by the body boring and the control valve right-hand end face and containing a return spring acting on the slide valve. The slide valve incorporates an additional spring-loaded channel communicating the right-hand space with the outlet channel, while the channel communicating the outlet channel with the right-hand space accommodates an additional throttle. In compliance with the other valve version, the right-hand space can communicate via the spring-loaded valve with the outlet channel. Here the additional spring-loaded valve is arranged inside the slide valve or in the main valve body.
EFFECT: smooth engagement of gearbox friction gear wheels.
4 cl, 5 dwg
FIELD: machine building.
SUBSTANCE: invention relates to hydro pneumatic automatic control devices and can be used in aircraft hydraulic control systems. The proposed valve incorporates a body with the pressure, control and drain channels separated by two cups arranged in the valve body and provided with aligned grooves and holes. A push rod is arranged in the said grooves to move therein. The aforesaid holes in the cups are made on both sides of the push rod to contact, by their outer edges, with the ball-like shut-off members. One of the said balls, on the drain side, interacts with a spring-loaded rod moving inside the electromagnetic drive stator. Note that in one position of the aforesaid rod, the control channel communicates with the drain line while, in the other position, it communicates with the pressure channel. There is a spring-loaded plunger fitted in the valve body of the pressure side, its end face interacting with the shut-off member on the aforesaid side. Cylindrical collars are made on the outer surface of every cup on the side of holes and aligned with them. One of the said collar accommodates on the drain side a sleeve locked in a blind groove aligned with the sleeve through hole receiving a ball. The collar of other cup, but on the pressure side, accommodates a similar sleeve with the ball.
EFFECT: higher valve tightness.
FIELD: machine building.
SUBSTANCE: distributor is designed for supply and withdrawal of fluid into cavity of hydraulic engine and for protecting it from overloads, for locking cavity and for maintaining suspended load, for replacing load from cavity of hydraulic engine and damping to facilitate uniform motion at any specified speed. The distributor consists of a rectangular metal case of platen mounting with bypass, supply and drain lines, of a safety valve with a pilot, of a controlled valve with a pilot and two back valves each including a bush-seat, a ball and a spring. Also a safety valve is installed into the end of the case along its lengthwise axis; the valve is equipped with two control valves and the pilot. The control valve with the pilot is installed perpendicular to lengthwise axis of the case. Notably, under-valve cavity of the safety valve is connected with a side surface of the gate of the control valve and the drain line via a channel; the supply line is connected to the under valve cavity of the control valve; the drain line is connected with the side surface of the safety valve, while the back valves are installed in withdrawal channels of drain and supply lines; the back valves shut off the channels pressure tight from overflows of fluid from one line to another.
EFFECT: facilitating multi-functionality of device, simplicity of fabrication, high maintainability, easy control and high reliability.
FIELD: machine building.
SUBSTANCE: in amplifier there is implemented jet amplifier stage with two pressure nozzles and correspondingly with two receiving channels connected by means of their hydraulic lines with sub-end cavities of slide. The jet amplifier stage consists of two cylinder elements coaxially and with a gap installed in a case. A deflector gate of an electro-mechanic converter is arranged in slots in the cylinder elements from the side of ends facing each other. The pressure nozzle and the receiving channel are coaxially arranged in the slot of each element from the side of cylinder surface. Threaded sleeves are screwed on threaded ends of the cylinder elements from the side opposite to the slot. With their external thread the sleeves are screwed into the case. Also thread in the case, on the cylinder elements and correspondingly in the threaded sleeves has different pitch.
EFFECT: improved processability of fabrication, simplification of jet amplifier design and facilitation of its adjustment with high accuracy.